Rock drill



Oct. 12,1926. I 1,602,953

W. A. SMITH ROCK DRILL .Filed Sept. 50, 1921 2 Sheets-Sheet l 7028mm A .SmZZW WWW Oct. 12,1926. 1 1.601953 V W. A. SMITH ROCK DRILL File'd Sept: :so, 1921 2 Sheets-Sheet 2 74 52 2 zam ,1 571? 3-01 "6% gw o Patented Oct. 12, 1926.

UNITED STATES V 1,602,953 PATENT ()FFICE.

WILLIAM A. SMITH, 0F DETROIT, MICHIGAN, ASSIGNOR T0 CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N Y.. A CORPORATION OF NEW JERSEY.

nocx DRILL.

Application filed September 30, 1921. Serial No. 504,272.

The invention relates to percussive tools of that type having a rotary motor for revolving the tool combined with the reciprocatory motor for furnishing the impact. It is the object of the invention'to obtain asimple and convenient arrangement of the parts and to this end the invention consists in the construction as hereinafter set forth.

In the drawings:

Figure 1 is a side elevation of the tool;

Figure 2 is a longitudinal section on line 22 of Figures 1 and 3;

Figure 3 is a cross-section on line 3-3 of Figure 2;

Figure 4 is a cross-section on line 4-4 of Figure 2; and

Figure 5 is a longitudinal section on line 5-5 of Figure 3.

A is the barrel or cylinder of the reciprocatory motor, B is the piston therein; C is the drill or tool proper; D is the anvil or member which receives the impact of the pis-' ton and transmits the same to the tool C, and E is a rotary socket for holding the tool C and imparting rotary movement thereto. As has been stated, the present invention relates to that type of tool in which the rotary movement for the socket and drill is furnished by a rotary motor. This motor is fluid-operated and is preferably of the intermeshing gear type. There is also a stepdown transmission mechanism between the motor and the socket which reduces the speed and increases the torque. I have de-,

signed an exceedingly simple and convenient arrangement in which the motor is mounted at the head end of the barrel or cylinder A, while the step-down gearing is arranged in an intermediate compartment between the motor and the barrel. Thus, as shown, F is the rotary motor casing containing the intermeshing gears G and G, the former being mounted on the driven shaft, H extending through the casing F towards the barrel. The inner wall ofthe motor casing is formed by a hollow casing I which forms a housing for the step-down transmission and also a spacer between the motor casing and the head J of the barrel. Within the housing I the shaft H has mounted thereon a pinion K which meshes with a larger gear L and the latter is mounted upon a shaft M extending longitudinally of the barrel out-side the same and provided at its opposite end with a pinion N in mesh with an annular gear 0 on the rotary socket E. The shaft M is journaled in a hollow radial extension P of the barrel. Q is a throttle valve which controls the supply of motive fluid to the motor.

With the construction as thus far described, when the motor is in operation, its movement will be transmitted through the shaft H, pinion K, gear wheel L, shaft M,

pinion N and annular gear O to the rotary socket E, while at the same time reciprocatory movement is imparted to-the piston B to deliver blows upon the anvil D, transmitting the same to the tool C. WVhere the tool is used as a rock drill, it is usual to provide a stream of water which flows through the axis of the tool to near the cutting edge and serves to wash away the chips. It is also usual to pass the conduit for conveying this water through the axis of the reciprocating piston and the head of the barrel. With my improved construction, the motor being arranged at the head of the barrel, is in the path of this water supplying conduit, but I have avoided this difficulty by arranging one of the gears G of the motor in axial alignment with the barrel and by passing the water supplying conduit through the common axis. Thus, as shown, R is a water conduit extending longitudinally through the axis of the barrel and through the head J thereof. S is a lug within the housing I which is apertured for the passage of the conduit R. This permit-s the conduit R to extend from the outer end of the barrel inward through the motor, piston and anvil and into the hollow tool C.

My construction is one which is easy to assemble as the head J, housing I and motor casing F may be successively placed in position. All of these parts are then held in fixed relation by a pair of longitudinally extending bolts U which pass through ears V in the casing F and corresponding ears in the housing V for the rotary socket E. The barrel, head J and housing I are clamped between these members and are held from rotational displacement by pins W.

lVhat I claim as my invention is:

1. The combination with the barrel for a reciprocatory piston and a rotary tool holder at one end thereof, of a rotary gear motor mounted at the opposite end of said barrel, one gear of said motor being in axial alignment with said barrel, a trans mission between. said. rotary motor and re tary tool holder including intermeshing gears, and a housing for said intermeshing gears interposed between said barrel and motor.

2. The combination with the barrel tor a reciproeatory piston and a rotary tool holder at one end thereof, of a rotary motor mounted at the opposite end of said barrel, a portion of said motor being in axial alignment with said barrel, a transmission between rotary motor and rotary tool holder CO111j] )1'lSlD;1 a shaft extending longi' tudinally ot' the barrel outside the same, and step-down gearing; between the motor and said shaft. and housing for said step-down gearing intermodia e the motor and the barrel and partly in aligzgnn'ient with the latter.

3. The combination with the barrel for a reeiprocatory motor and a rotary tool holder at one end thereof, of a rotary motor mounted at the opposite end of said barrel, a head at the latter end of the barrel, a hollow casino: between said head and said rotary motor parts of said rotary motor and said casing; being in axial alignment with said reeiprocatory motor, and a trans mission between said rotary motor and rotary tool holder including: inter-meshing gears housed in said hollow casing.

4.. The combination with the barrel tor a reeiproeatory motor and a rotary tool holder at one end thereof, of a fluid actuated rotary motor mounted at the opposite end of said barrel, a head at the latter end of the barrel, a hollow casing between said head and motor, a transmission between said mot-or and rotary tool holder including intermeshing gears housed in said hollow casing, and a fluid conduit extendingaxi'al'ly through the reoiproeatory motor, one of the rotary motor and the interme diate head and easing.

The combination with a barrel tor a reciprooatory motor and a rotary tool holder at one end thereof. of a rotary motor mounted at the opposite end 01": said barrel, a head at the latter end of the barrel, a hollow casing between said head and motor, a transmission meohanism between said motor and rotary tool holder, including intermeshing gears housed in said hollow easing, said rotary motor and said hollow casing being at least partly in axial alignment with said barrel, and bolts connecting the rotary motor casing and the barrel clamping said tra1-1smission housing and head tor the reeiproeatory motor therebetween.

G. T he combination with the barrel tor a reei irocatory motor, and a rotary tool holder mounted at one end thereof, ot a rotary motor mounted at the opposite end of said barrel, a head at the-latter end of t barrel, a hollow easing between said l d and motor, a transmission "between said motor and rotary tool holder in-"Jluding, intermesl'iing ,ejears housed in said hollow easing and a water tube extending axially through the reeiprooatory motor. one of the rotary motor gears and the intermediate head and easing.

In testimony whereof I atlix my signature.

WILLIAM A. SMITH. 

